Tropical Cyclone Warning Signal No. 8 is now in effect, the Observatory has announced.
The public is warned to brace for strong winds and rain as Typhoon Haima edges closer to Hong Kong.
The storm is expected to come within 100 kilometers of Hong Kong by Friday noon.
Most ferry and bus services will be suspended at or before 7 a.m., and flights to and from Chek Lap Kok may be canceled or delayed, public broadcaster RTHK reports.
Cathay Pacific, Dragonair and Hong Kong Airlines urge passengers booked to fly on Friday and Saturday to check the status of their flights before heading to the airport.
The Education Bureau says classes at all kindergartens and day-schools are suspended.
At 6 a.m. on Friday, Haima was estimated to be more than 200 kilometers southeast of Hong Kong and moving at 25 kilometers per hour.
The standby signal number one was issued by the Observatory on Thursday morning, followed by the strong wind signal number three at 8:40 p.m.
Haima caused flooding, landslides and power outages in the northern Philippines, particularly the provinces of Cagayan and Isabela.
At least eight people were killed, but large-scale casualties appeared to have been averted after nearly 100,000 people were moved to safer ground, the report said.
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